Target's popular car seat trade-in event returns this month.

From Sept. 9-22, guests can bring any expired or unwanted car seats in to most Target stores for recycling, and receive a 20 percent coupon valid for the purchase of a new car seat, car seat base, travel system or stroller. As a bonus, for the first time, select baby home gear, such as playards, high chairs, swings, rockers and bouncers are also included in the discount!

Target will accept and recycle all types of car seats, including infant seats, convertible seats, car seat bases, harness or booster car seats and car seats that are expired or damaged. Waste Management will recycle items collected during the trade in. They'll turn the car seats into new products like pallets and plastic buckets, as well as construction materials like steel beams and carpet padding.

Since the program first started in April 2016, more than 306,000 car seats—equaling more than 4.6 million pounds of materials—have been recycled.